lib/zip_extra_field.c - third_party/libzip - Git at Google

 /*
   zip_extra_field.c -- manipulate extra fields
   Copyright (C) 2012-2021 Dieter Baron and Thomas Klausner

   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the
      distribution.
   3. The names of the authors may not be used to endorse or promote
      products derived from this software without specific prior
      written permission.

   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 #include <stdlib.h>
 #include <string.h>

 #include "zipint.h"


 zip_extra_field_t *
 _zip_ef_clone(const zip_extra_field_t *ef, zip_error_t *error) {
     zip_extra_field_t *head, *prev, *def;

     head = prev = NULL;

     while (ef) {
         if ((def = _zip_ef_new(ef->id, ef->size, ef->data, ef->flags)) == NULL) {
             zip_error_set(error, ZIP_ER_MEMORY, 0);
             _zip_ef_free(head);
             return NULL;
         }

         if (head == NULL)
             head = def;
         if (prev)
             prev->next = def;
         prev = def;

         ef = ef->next;
     }

     return head;
 }


 zip_extra_field_t *
 _zip_ef_delete_by_id(zip_extra_field_t *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags) {
     zip_extra_field_t *head, *prev;
     int i;

     i = 0;
     head = ef;
     prev = NULL;
     for (; ef; ef = (prev ? prev->next : head)) {
         if ((ef->flags & flags & ZIP_EF_BOTH) && ((ef->id == id) || (id == ZIP_EXTRA_FIELD_ALL))) {
             if (id_idx == ZIP_EXTRA_FIELD_ALL || i == id_idx) {
                 ef->flags &= ~(flags & ZIP_EF_BOTH);
                 if ((ef->flags & ZIP_EF_BOTH) == 0) {
                     if (prev)
                         prev->next = ef->next;
                     else
                         head = ef->next;
                     ef->next = NULL;
                     _zip_ef_free(ef);

                     if (id_idx == ZIP_EXTRA_FIELD_ALL)
                         continue;
                 }
             }

             i++;
             if (i > id_idx)
                 break;
         }
         prev = ef;
     }

     return head;
 }


 void
 _zip_ef_free(zip_extra_field_t *ef) {
     zip_extra_field_t *ef2;

     while (ef) {
         ef2 = ef->next;
         free(ef->data);
         free(ef);
         ef = ef2;
     }
 }


 const zip_uint8_t *
 _zip_ef_get_by_id(const zip_extra_field_t *ef, zip_uint16_t *lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags, zip_error_t *error) {
     static const zip_uint8_t empty[1] = {'\0'};

     int i;

     i = 0;
     for (; ef; ef = ef->next) {
         if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
             if (i < id_idx) {
                 i++;
                 continue;
             }

             if (lenp)
                 *lenp = ef->size;
             if (ef->size > 0)
                 return ef->data;
             else
                 return empty;
         }
     }

     zip_error_set(error, ZIP_ER_NOENT, 0);
     return NULL;
 }


 zip_extra_field_t *
 _zip_ef_merge(zip_extra_field_t *to, zip_extra_field_t *from) {
     zip_extra_field_t *ef2, *tt, *tail;
     int duplicate;

     if (to == NULL)
         return from;

     for (tail = to; tail->next; tail = tail->next)
         ;

     for (; from; from = ef2) {
         ef2 = from->next;

         duplicate = 0;
         for (tt = to; tt; tt = tt->next) {
             if (tt->id == from->id && tt->size == from->size && (tt->size == 0 || memcmp(tt->data, from->data, tt->size) == 0)) {
                 tt->flags |= (from->flags & ZIP_EF_BOTH);
                 duplicate = 1;
                 break;
             }
         }

         from->next = NULL;
         if (duplicate)
             _zip_ef_free(from);
         else
             tail = tail->next = from;
     }

     return to;
 }


 zip_extra_field_t *
 _zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags) {
     zip_extra_field_t *ef;

     if ((ef = (zip_extra_field_t *)malloc(sizeof(*ef))) == NULL)
         return NULL;

     ef->next = NULL;
     ef->flags = flags;
     ef->id = id;
     ef->size = size;
     if (size > 0) {
         if ((ef->data = (zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
             free(ef);
             return NULL;
         }
     }
     else
         ef->data = NULL;

     return ef;
 }


 bool
 _zip_ef_parse(const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags, zip_extra_field_t **ef_head_p, zip_error_t *error) {
     zip_buffer_t *buffer;
     zip_extra_field_t *ef, *ef2, *ef_head;

     if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
         zip_error_set(error, ZIP_ER_MEMORY, 0);
         return false;
     }

     ef_head = ef = NULL;

     while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
         zip_uint16_t fid, flen;
         zip_uint8_t *ef_data;

         fid = _zip_buffer_get_16(buffer);
         flen = _zip_buffer_get_16(buffer);
         ef_data = _zip_buffer_get(buffer, flen);

         if (ef_data == NULL) {
             zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_EF_LENGTH);
             _zip_buffer_free(buffer);
             _zip_ef_free(ef_head);
             return false;
         }

         if ((ef2 = _zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
             zip_error_set(error, ZIP_ER_MEMORY, 0);
             _zip_buffer_free(buffer);
             _zip_ef_free(ef_head);
             return false;
         }

         if (ef_head) {
             ef->next = ef2;
             ef = ef2;
         }
         else
             ef_head = ef = ef2;
     }

     if (!_zip_buffer_eof(buffer)) {
         /* Android APK files align stored file data with padding in extra fields; ignore. */
         /* see https://android.googlesource.com/platform/build/+/master/tools/zipalign/ZipAlign.cpp */
         size_t glen = _zip_buffer_left(buffer);
         zip_uint8_t *garbage;
         garbage = _zip_buffer_get(buffer, glen);
         if (glen >= 4 || garbage == NULL || memcmp(garbage, "\0\0\0", glen) != 0) {
             zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_EF_TRAILING_GARBAGE);
             _zip_buffer_free(buffer);
             _zip_ef_free(ef_head);
             return false;
         }
     }

     _zip_buffer_free(buffer);

     if (ef_head_p) {
         *ef_head_p = ef_head;
     }
     else {
         _zip_ef_free(ef_head);
     }

     return true;
 }


 zip_extra_field_t *
 _zip_ef_remove_internal(zip_extra_field_t *ef) {
     zip_extra_field_t *ef_head;
     zip_extra_field_t *prev, *next;

     ef_head = ef;
     prev = NULL;

     while (ef) {
         if (ZIP_EF_IS_INTERNAL(ef->id)) {
             next = ef->next;
             if (ef_head == ef)
                 ef_head = next;
             ef->next = NULL;
             _zip_ef_free(ef);
             if (prev)
                 prev->next = next;
             ef = next;
         }
         else {
             prev = ef;
             ef = ef->next;
         }
     }

     return ef_head;
 }


 zip_uint16_t
 _zip_ef_size(const zip_extra_field_t *ef, zip_flags_t flags) {
     zip_uint16_t size;

     size = 0;
     for (; ef; ef = ef->next) {
         if (ef->flags & flags & ZIP_EF_BOTH)
             size = (zip_uint16_t)(size + 4 + ef->size);
     }

     return size;
 }


 int
 _zip_ef_write(zip_t *za, const zip_extra_field_t *ef, zip_flags_t flags) {
     zip_uint8_t b[4];
     zip_buffer_t *buffer = _zip_buffer_new(b, sizeof(b));

     if (buffer == NULL) {
         return -1;
     }

     for (; ef; ef = ef->next) {
         if (ef->flags & flags & ZIP_EF_BOTH) {
             _zip_buffer_set_offset(buffer, 0);
             _zip_buffer_put_16(buffer, ef->id);
             _zip_buffer_put_16(buffer, ef->size);
             if (!_zip_buffer_ok(buffer)) {
                 zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
                 _zip_buffer_free(buffer);
                 return -1;
             }
             if (_zip_write(za, b, 4) < 0) {
                 _zip_buffer_free(buffer);
                 return -1;
             }
             if (ef->size > 0) {
                 if (_zip_write(za, ef->data, ef->size) < 0) {
                     _zip_buffer_free(buffer);
                     return -1;
                 }
             }
         }
     }

     _zip_buffer_free(buffer);
     return 0;
 }


 int
 _zip_read_local_ef(zip_t *za, zip_uint64_t idx) {
     zip_entry_t *e;
     unsigned char b[4];
     zip_buffer_t *buffer;
     zip_uint16_t fname_len, ef_len;

     if (idx >= za->nentry) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     e = za->entry + idx;

     if (e->orig == NULL || e->orig->local_extra_fields_read)
         return 0;

     if (e->orig->offset + 26 > ZIP_INT64_MAX) {
         zip_error_set(&za->error, ZIP_ER_SEEK, EFBIG);
         return -1;
     }

     if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
         _zip_error_set_from_source(&za->error, za->src);
         return -1;
     }

     if ((buffer = _zip_buffer_new_from_source(za->src, sizeof(b), b, &za->error)) == NULL) {
         return -1;
     }

     fname_len = _zip_buffer_get_16(buffer);
     ef_len = _zip_buffer_get_16(buffer);

     if (!_zip_buffer_eof(buffer)) {
         _zip_buffer_free(buffer);
         zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
         return -1;
     }

     _zip_buffer_free(buffer);

     if (ef_len > 0) {
         zip_extra_field_t *ef;
         zip_uint8_t *ef_raw;

         if (zip_source_seek(za->src, fname_len, SEEK_CUR) < 0) {
             zip_error_set(&za->error, ZIP_ER_SEEK, errno);
             return -1;
         }

         ef_raw = _zip_read_data(NULL, za->src, ef_len, 0, &za->error);

         if (ef_raw == NULL)
             return -1;

         if (!_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &ef, &za->error)) {
             free(ef_raw);
             return -1;
         }
         free(ef_raw);

         if (ef) {
             ef = _zip_ef_remove_internal(ef);
             e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
         }
     }

     e->orig->local_extra_fields_read = 1;

     if (e->changes && e->changes->local_extra_fields_read == 0) {
         e->changes->extra_fields = e->orig->extra_fields;
         e->changes->local_extra_fields_read = 1;
     }

     return 0;
 }
	/*
	zip_extra_field.c -- manipulate extra fields
	Copyright (C) 2012-2021 Dieter Baron and Thomas Klausner

	This file is part of libzip, a library to manipulate ZIP archives.
	The authors can be contacted at <libzip@nih.at>

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions
	are met:
	1. Redistributions of source code must retain the above copyright
	notice, this list of conditions and the following disclaimer.
	2. Redistributions in binary form must reproduce the above copyright
	notice, this list of conditions and the following disclaimer in
	the documentation and/or other materials provided with the
	distribution.
	3. The names of the authors may not be used to endorse or promote
	products derived from this software without specific prior
	written permission.

	THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
	DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
	GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
	IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
	IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <stdlib.h>
	#include <string.h>

	#include "zipint.h"


	zip_extra_field_t *
	_zip_ef_clone(const zip_extra_field_t ef, zip_error_t error) {
	zip_extra_field_t head, prev, *def;

	head = prev = NULL;

	while (ef) {
	if ((def = _zip_ef_new(ef->id, ef->size, ef->data, ef->flags)) == NULL) {
	zip_error_set(error, ZIP_ER_MEMORY, 0);
	_zip_ef_free(head);
	return NULL;
	}

	if (head == NULL)
	head = def;
	if (prev)
	prev->next = def;
	prev = def;

	ef = ef->next;
	}

	return head;
	}


	zip_extra_field_t *
	_zip_ef_delete_by_id(zip_extra_field_t *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags) {
	zip_extra_field_t head, prev;
	int i;

	i = 0;
	head = ef;
	prev = NULL;
	for (; ef; ef = (prev ? prev->next : head)) {
	if ((ef->flags & flags & ZIP_EF_BOTH) && ((ef->id == id) \|\| (id == ZIP_EXTRA_FIELD_ALL))) {
	if (id_idx == ZIP_EXTRA_FIELD_ALL \|\| i == id_idx) {
	ef->flags &= ~(flags & ZIP_EF_BOTH);
	if ((ef->flags & ZIP_EF_BOTH) == 0) {
	if (prev)
	prev->next = ef->next;
	else
	head = ef->next;
	ef->next = NULL;
	_zip_ef_free(ef);

	if (id_idx == ZIP_EXTRA_FIELD_ALL)
	continue;
	}
	}

	i++;
	if (i > id_idx)
	break;
	}
	prev = ef;
	}

	return head;
	}


	void
	_zip_ef_free(zip_extra_field_t *ef) {
	zip_extra_field_t *ef2;

	while (ef) {
	ef2 = ef->next;
	free(ef->data);
	free(ef);
	ef = ef2;
	}
	}


	const zip_uint8_t *
	_zip_ef_get_by_id(const zip_extra_field_t ef, zip_uint16_t lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags, zip_error_t *error) {
	static const zip_uint8_t empty[1] = {'\0'};

	int i;

	i = 0;
	for (; ef; ef = ef->next) {
	if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
	if (i < id_idx) {
	i++;
	continue;
	}

	if (lenp)
	*lenp = ef->size;
	if (ef->size > 0)
	return ef->data;
	else
	return empty;
	}
	}

	zip_error_set(error, ZIP_ER_NOENT, 0);
	return NULL;
	}


	zip_extra_field_t *
	_zip_ef_merge(zip_extra_field_t to, zip_extra_field_t from) {
	zip_extra_field_t ef2, tt, *tail;
	int duplicate;

	if (to == NULL)
	return from;

	for (tail = to; tail->next; tail = tail->next)
	;

	for (; from; from = ef2) {
	ef2 = from->next;

	duplicate = 0;
	for (tt = to; tt; tt = tt->next) {
	if (tt->id == from->id && tt->size == from->size && (tt->size == 0 \|\| memcmp(tt->data, from->data, tt->size) == 0)) {
	tt->flags \|= (from->flags & ZIP_EF_BOTH);
	duplicate = 1;
	break;
	}
	}

	from->next = NULL;
	if (duplicate)
	_zip_ef_free(from);
	else
	tail = tail->next = from;
	}

	return to;
	}


	zip_extra_field_t *
	_zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags) {
	zip_extra_field_t *ef;

	if ((ef = (zip_extra_field_t )malloc(sizeof(ef))) == NULL)
	return NULL;

	ef->next = NULL;
	ef->flags = flags;
	ef->id = id;
	ef->size = size;
	if (size > 0) {
	if ((ef->data = (zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
	free(ef);
	return NULL;
	}
	}
	else
	ef->data = NULL;

	return ef;
	}


	bool
	_zip_ef_parse(const zip_uint8_t data, zip_uint16_t len, zip_flags_t flags, zip_extra_field_t ef_head_p, zip_error_t error) {
	zip_buffer_t *buffer;
	zip_extra_field_t ef, ef2, *ef_head;

	if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
	zip_error_set(error, ZIP_ER_MEMORY, 0);
	return false;
	}

	ef_head = ef = NULL;

	while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
	zip_uint16_t fid, flen;
	zip_uint8_t *ef_data;

	fid = _zip_buffer_get_16(buffer);
	flen = _zip_buffer_get_16(buffer);
	ef_data = _zip_buffer_get(buffer, flen);

	if (ef_data == NULL) {
	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_EF_LENGTH);
	_zip_buffer_free(buffer);
	_zip_ef_free(ef_head);
	return false;
	}

	if ((ef2 = _zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
	zip_error_set(error, ZIP_ER_MEMORY, 0);
	_zip_buffer_free(buffer);
	_zip_ef_free(ef_head);
	return false;
	}

	if (ef_head) {
	ef->next = ef2;
	ef = ef2;
	}
	else
	ef_head = ef = ef2;
	}

	if (!_zip_buffer_eof(buffer)) {
	/* Android APK files align stored file data with padding in extra fields; ignore. */
	/* see https://android.googlesource.com/platform/build/+/master/tools/zipalign/ZipAlign.cpp */
	size_t glen = _zip_buffer_left(buffer);
	zip_uint8_t *garbage;
	garbage = _zip_buffer_get(buffer, glen);
	if (glen >= 4 \|\| garbage == NULL \|\| memcmp(garbage, "\0\0\0", glen) != 0) {
	zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_EF_TRAILING_GARBAGE);
	_zip_buffer_free(buffer);
	_zip_ef_free(ef_head);
	return false;
	}
	}

	_zip_buffer_free(buffer);

	if (ef_head_p) {
	*ef_head_p = ef_head;
	}
	else {
	_zip_ef_free(ef_head);
	}

	return true;
	}


	zip_extra_field_t *
	_zip_ef_remove_internal(zip_extra_field_t *ef) {
	zip_extra_field_t *ef_head;
	zip_extra_field_t prev, next;

	ef_head = ef;
	prev = NULL;

	while (ef) {
	if (ZIP_EF_IS_INTERNAL(ef->id)) {
	next = ef->next;
	if (ef_head == ef)
	ef_head = next;
	ef->next = NULL;
	_zip_ef_free(ef);
	if (prev)
	prev->next = next;
	ef = next;
	}
	else {
	prev = ef;
	ef = ef->next;
	}
	}

	return ef_head;
	}


	zip_uint16_t
	_zip_ef_size(const zip_extra_field_t *ef, zip_flags_t flags) {
	zip_uint16_t size;

	size = 0;
	for (; ef; ef = ef->next) {
	if (ef->flags & flags & ZIP_EF_BOTH)
	size = (zip_uint16_t)(size + 4 + ef->size);
	}

	return size;
	}


	int
	_zip_ef_write(zip_t za, const zip_extra_field_t ef, zip_flags_t flags) {
	zip_uint8_t b[4];
	zip_buffer_t *buffer = _zip_buffer_new(b, sizeof(b));

	if (buffer == NULL) {
	return -1;
	}

	for (; ef; ef = ef->next) {
	if (ef->flags & flags & ZIP_EF_BOTH) {
	_zip_buffer_set_offset(buffer, 0);
	_zip_buffer_put_16(buffer, ef->id);
	_zip_buffer_put_16(buffer, ef->size);
	if (!_zip_buffer_ok(buffer)) {
	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
	_zip_buffer_free(buffer);
	return -1;
	}
	if (_zip_write(za, b, 4) < 0) {
	_zip_buffer_free(buffer);
	return -1;
	}
	if (ef->size > 0) {
	if (_zip_write(za, ef->data, ef->size) < 0) {
	_zip_buffer_free(buffer);
	return -1;
	}
	}
	}
	}

	_zip_buffer_free(buffer);
	return 0;
	}


	int
	_zip_read_local_ef(zip_t *za, zip_uint64_t idx) {
	zip_entry_t *e;
	unsigned char b[4];
	zip_buffer_t *buffer;
	zip_uint16_t fname_len, ef_len;

	if (idx >= za->nentry) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	e = za->entry + idx;

	if (e->orig == NULL \|\| e->orig->local_extra_fields_read)
	return 0;

	if (e->orig->offset + 26 > ZIP_INT64_MAX) {
	zip_error_set(&za->error, ZIP_ER_SEEK, EFBIG);
	return -1;
	}

	if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
	_zip_error_set_from_source(&za->error, za->src);
	return -1;
	}

	if ((buffer = _zip_buffer_new_from_source(za->src, sizeof(b), b, &za->error)) == NULL) {
	return -1;
	}

	fname_len = _zip_buffer_get_16(buffer);
	ef_len = _zip_buffer_get_16(buffer);

	if (!_zip_buffer_eof(buffer)) {
	_zip_buffer_free(buffer);
	zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
	return -1;
	}

	_zip_buffer_free(buffer);

	if (ef_len > 0) {
	zip_extra_field_t *ef;
	zip_uint8_t *ef_raw;

	if (zip_source_seek(za->src, fname_len, SEEK_CUR) < 0) {
	zip_error_set(&za->error, ZIP_ER_SEEK, errno);
	return -1;
	}

	ef_raw = _zip_read_data(NULL, za->src, ef_len, 0, &za->error);

	if (ef_raw == NULL)
	return -1;

	if (!_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &ef, &za->error)) {
	free(ef_raw);
	return -1;
	}
	free(ef_raw);

	if (ef) {
	ef = _zip_ef_remove_internal(ef);
	e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
	}
	}

	e->orig->local_extra_fields_read = 1;

	if (e->changes && e->changes->local_extra_fields_read == 0) {
	e->changes->extra_fields = e->orig->extra_fields;
	e->changes->local_extra_fields_read = 1;
	}

	return 0;
	}